Firebox siphon



Aug. 8, 1944. T. H. FAWCETT 2,355,590.

FIRE BOX SYPHON Filed March 12, 1941 v /8 L18 /7 A 22 I 7 l8 l7 l7' L5 1 /O Q /4 5 INVENTOR Patented Aug. 8, 1944 UNITED STAT-ES PATENT OFFlCE Y ;f

FIREBOX SIPHON Fawceta,Philadelphiat Pa assignor I i a Y to-The Baldwin Locomotive: Works, a, corpora "tion ofPenns'ylvania I ""Application March 12, 1941, Serial.No.13$2,953

2 Claims. (Cl. 122-68) This invention relates generally to fire box provement of my invention is that the flat hollow siphons particularly of the type having a relabody I is provided with a plurality of substantively large flat hollow body connected at its bottially tubular preferably cylindrical outlets I'l, tom with a front water leg and at its top with specifically shown as fourin numbenalthoughany the crown sheet. other number may be employed depending upon It is an object of my invention to provide an the size and capacity of the boiler, it being unimproved fire box siphon of the above type derstood that the outlets I! are spaced apart whereby a high rate of water circulation may be from each other so that the crown sheet 4 has obtained over the crown sheet but without allowvery substantial transverse portions l8 between ing the connection with the crown sheet to weak- 10 the adjacent outlet legs t eby maintaining t en the same or to form pockets or other obtransverse strength of the crown sheet which has structions which would cause an accumulation of heretofore been difficult to do with the flat body sediment with consequent danger of burning out typ of siphon. To insure adequate circulation the crown sheet. of water Within the siphon and at the same A further object is to provide an improved fire time to provide suificient physical strength of box siphon of the above type whereby the outlet the outlets I! as well as their juncture with the connections of the flat body are formed in such flat body, the ow e of a Outlet is p e e a manner that they may be readily, economically ably formed by wide sweepin Curves 9 Which and efficiently placed and secured in position Curve y from e Crown eet d e tend in while maintaining full transverse strength of the pposite lon tu al d rections from one outlet crown sheet together with having continuous to the other while in transverse section the walls flow throughout an ortions of th siph0n l9 have a concave interior surface and a convex Other objects and advantages will be m outer surface as is generally indicated at 2ll,'Fig. apparent to those skilled in th art from th 2. Hence, the entire inner surface of the siphon following description of the accompanying drawpr en s a mo t w passage at all Points in i whi h: thereby preventing the accumulation of sediment Fig, 1 i a longitudinal ti thr h th or other foreign matter and at the same time fir box d of b il embodying my improved insuring maximum strength of the outlet necks siphon; at their juncture with the flat body. The necks Fig. 2 is a transverse section taken on the line are preferably W e at their j u e With the 2 2 of Fig, 1; d crown sheet on the under side thereof as gen- Fig. 3 is a fragmentary section taken on the erally indicated at 22. The necks are preferably line 3-3 of Fig. 1. received in circular openings in the crown sheet In the particular embodiment of the invenand extend to a po nt S ightly abOVe the ppe tion I have shown a conventional type of boiler Surface thereof- The l wer edge l3 of the siphon having a fire box I including back and front o y n nu r w r y n r s pwardly water legs 2 and 3 and crown and fire tube sheets to form the rm e of the rear outlet 4 and 5 respectively while a usual roof sheet 6 neck while the front edge S ar y fo s the is connected by stay bolts 1 with the crown sheet front edge of the foremost outlet neck.

and fire tubes 8 extend from tube sheet 5. From t f e ng disclosure it is seen that I My improved siphon generally indicated at 9 have provided a p e and yet e e e y S o has a relatively large flat hollow body In conand effective arrangement for connecting the nected by a usual inlet neck II with the front Siphon together W su ng maximum strength water leg 3 at a point adjacent the boiler throat of the crown sheet in a transverse direction as I2. The lower portion of the neck II is preferl5 e l as Obtaining uniform high Ve ty ow of ably formed as a straight continuation of the Water v all portions o e p o nd crown lowermost edge [3 of the siphon body while the sheet without the formation of pockets or other upper edge of neck ll connects through a wide obstructions tending to cause excessive accumusweeping reverse curve It with the front end lation of sediment or other foreign material of the siphon body. The neck II is preferably which would cause burning out of the crown circular in cross-section and extends into a suit I sheet or other parts.

able flanged opening l5 of the front water leg A further advantage of my improved spaced to be welded thereto. The neck H is relatively outlet necks is that the crown sheet has a porlarge in diameter as compared to the width of tion immediately above the siphon body exposed the body In as seen in Fig. 2. The particular imto the fire box gases which have a free circulation from one side of the siphon to the other, this advantage not being obtainable in prior art forms of flat body type siphons.

It will of course be understood that various changes in details of construction and arrangement of parts may be made by those skilled in the art without departing from the spirit of the invention as set forth in the appended claims.

I claim:-

1. In combination, a fire box having a crown sheet and front water leg, and a siphon formed of a relatively large body having an inlet neck at its lower part communicating with said front:

water leg and having a plurality of outlet necks at its upper part for connection to the crown sheet, said body portion having a lowermost wall which curves upwardly to form the back end of the siphon while the top of 'said inlet neck curves in a reverse direction toward the front of the fire box and then curves upwardly to form the front edge of the siphon, and at least certain of said outlet necks being of tubular formation and including said front and rear edges of the siphon.

2. In combination a fire box box having a crown sheet and front water leg, and a siphon formed'ofasrelatively large bodyhaving an inlet neck at its lowerpart communicating with said front water leg and having a plurality of outlet necks at its upper part for connection to the crown sheet, said outlet necks being substantially of tubular formation spaced from each other and joined together at their lower ends by walls which are curved" in both. longitudinal and transverse planes;

THOMAS H. FAWCETT. 

